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مجموع الزيارات

By Amin Sarhan - Aug 2, 2012

Researchers believe that migrating birds sleep by taking hundreds of daytime naps to make up for no nighttime sleep.

Unlike mammals birds sleep with one-half of their brain awake to keep them alert to potential predators. Many other animals sleep the same way, but only birds have the ability to adjust how much of their brain are asleep by how wide they open or close their eyes. Another difference is that birds will not lose much muscle strength when in deep sleep regardless whether they stand, perch, roost, lay down on the ground, swim, or hang upside down (yes, these are all real sleeping positions). Birds fluff up their feathers when sleeping in order to keep warm. Many birds bend their heads over their backs and tuck their bills in their back feathers. While others place their beaks among their breast feathers.